Richard Douglas George

US Patent:

52440001, Sep 14, 1993

Filed:

Jul 24, 1992

Appl. No.:

7/918082

Inventors:

Thomas B. Stanford - San Pedro CA
Richard C. George - Topanga CA
Jennifer I. Shinno - Canoga Park CA
Dhiren C. Mehta - Cypress CA
Gifford W. Rodine - El Segundo CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

B08B 308

US Classification:

134 951

Abstract:

A method for removing contaminants from a solid substrate comprising, in a preferred embodiment: (a) providing an initial reaction bath comprising: (1) an alkaline compound in sufficient amount to provide a pH of 10. 5 to 14. 0 in the final reaction bath; (2) a chosen wetting agent which is stable in the presence of the alkaline compound and hydrogen peroxide; and (3) deionized water; (b) metering hydrogen peroxide into the initial and final reaction baths at a rate of about 0. 004 milligrams of hydrogen peroxide per minute per gallon of reaction bath fluid or higher; (c) sparging the initial and final reaction baths with air or oxygen at a rate of about 0. 001 to 1 standard cubic feet per minute; and (d) exposing the substrate having contaminants to the final reaction bath containing metered hydrogen peroxide and sparging air or oxygen. The hydrogen peroxide in the final reaction bath is maintained at an effective level for an extended period of time to remove said contaminants from the substrate in a uniform and controlled manner.

US Patent:

D2464659, Nov 22, 1977

Filed:

May 24, 1976

Appl. No.:

5/689004

Inventors:

James G. Bruni - Manhattan Beach CA
Richard W. George - Libertyville IL
Stephen G. Hauser - Tarzana CA
Charles E. Hodgson - Silver Spring MD
Richard J. Range - Silver Spring MD

Assignee:

Baxter Travenol Laboratories, Inc.

International Classification:

D2401

US Classification:

D24 21